Gas burner



FIG. 1 is a front perspective view of a gas burner according to our design;

FIG. 2 is a front elevational view thereof, back, left, and right views of the gas burner being identical thereto;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The broken line showings of various features are for the purpose of illustrating portions of the gas burner and form no part of the claimed design. 

CLAIM The ornamental design for a gas burner, as shown and described. 